1,720,985 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
A project to constrain emission from giant gaseous shells around high redshift radio galaxies
Get PDFFil: Moyano, Martín Manuel. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Merlo, David Constantino. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Around half of the radio galaxies (radio-loud, type 2 quasars) at 2 are known to show strong Ly absorption features in their spectra, with a spatial extent at least as large as the background Ly nebulae closely associated with the AGN host galaxy ( 10-100 kpc). Based on their observed properties to date, these absorbers are thought to be large-scale shells of gas surrounding the host galaxy and its Ly halo. Their origin is unclear, but is likely related to feedback processes in the host galaxy. In this work, we discuss our ongoing study of these absorbing shells using archival Hubble Space Telescope (HST) images of the rest-frame UV emission of 2.5 radio galaxies in order to search for these shells in emission, or to place constraints on their emission luminosity.Aproximadamente la mitad de las radiogalaxias ( fuertes emisores en radio con cuásares tipo 2) con z > 2 muestran espectros con una fuerte absorción en Lya, además de una extensión espacial al menos tan grande como la nebulosidad de fondo en Lya estrechamente asociado en el AGN de la galaxia anfitriona (~10- 100 kpe). En base a sus propiedades observadas hasta la fecha, se cree que estos absorbedores presentan estructuras de “càscaras” gaseosas a gran escala que rodea la galaxia anfitriona y a su halo en Lya. Su origen no está claro, pero estaría probablemente relacionado con los procesos de retroalimentación en la galaxia anfitriona.
En este trabajo realizamos una discusión de nuestro estudio, actualmente en curso, de estas estructuras de absorción utilizando el archivo del Telescopio Espacial Hubble (HST), correspondientes a imágenes en emisión UV ( en el marco de reposo) de radiogalaxias con z ~ 2.5 con el objetivo de buscar estas estructuras en emisión o establecer restricciones en su luminosidad.publishedVersionFil: Moyano, Martín Manuel. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Merlo, David Constantino. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Astronomía (incluye Astrofísica y Ciencias del Espacio
Estudio multifrecuencia del flujo bipolar-molecular asociado con la proto-estrella VLA 1623
Get PDFResumen. En este trabajo se presenta un estudio multi-frecuencia del flujo bipolar molecular asociado con la proto-estrella VLA 1623 (edad ∼ 104 años). Se analizan imágenes obtenidas por Spitzer así como también otras de literatura. Se identificaron 32 nodos con emisión en H2 (2.12 µm) y 25 objetos con emisión predominante en [4.5] µm, comúnmente conocidos como EGOs (Extended Green Objects; Cyganowski et al. 2008). Siete de estas emisiones son candidatos a nuevos EGOs; cinco de los cuales tienen contra-partes en 2.12 µm. Se compara la morfología de las emisiones detectadas en 2.12 µm y en [4.5] µm con el flujo bipolar molecular
observado por (Dent et al. 1995) y se encuentra un excelente acuerdo. Se observa un espaciamiento cuasi-regular entre las emisiones detectadas. Se determina un valor promedio para la escala de tiempo dinámico entre
nodos consecutivos de ∼ 194.3 años, lo que concuerda con el intervalo de tiempo entre eventos eruptivos de tipo FU Orionis. Esto sugiere que eventos de este tipo experimentados por la fuente central podrían ser la causa de la intermitencia de las emisiones detectadas.Abstract. In this work, we present a multi-wavelength study of the bipolar molecular outflow associated with the VLA 1623 proto-star (age ∼ 104 yrs). We analyze images obtained by Spitzer as well as other images from the literature. We identify 32 H2 (2.12 µm) emission knots and 25 objects predominantly emitting in the [4.5] µm band, usually known as EGOs (Extended Green Objects; Cyganowski et al. 2008). Seven of these emissions are new EGOs candidates; five of which have 2.12 µm counterparts. We compare the morphology of the emissions at 2.12 µm and [4.5] µm with the bipolar molecular outflow detected by (Dent et al. 1995) finding an excellent agreement. The emissions are quasi-regularly spaced. We determine a dynamical time of ∼ 194.3 yrs between consecutive knots, which agrees with the lapse of time between eruptive FU Orionis events.
This suggests that events of this type experimented by the central source
might be the cause of the intermittency in the detected emissions.Fil: Merlo, David Constantino. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Gómez, Mercedes. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Gómez, Mercedes. Conicet, Argentina.http://www.astronomiaargentina.org.arpublishedVersionFil: Merlo, David Constantino. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Gómez, Mercedes. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Gómez, Mercedes. Conicet, Argentina.Física de los Fluidos y Plasm
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
